<template>
  <view class="uni-cursor-point">
    <view
      v-if="popMenu && (leftBottom || rightBottom || leftTop || rightTop) && content.length > 0"
      :class="{
        'uni-fab--leftBottom': leftBottom,
        'uni-fab--rightBottom': rightBottom,
        'uni-fab--leftTop': leftTop,
        'uni-fab--rightTop': rightTop
      }"
      class="uni-fab"
      :style="nvueBottom"
    >
      <view
        :class="{
          'uni-fab__content--left': horizontal === 'left',
          'uni-fab__content--right': horizontal === 'right',
          'uni-fab__content--flexDirection': direction === 'vertical',
          'uni-fab__content--flexDirectionStart': flexDirectionStart,
          'uni-fab__content--flexDirectionEnd': flexDirectionEnd,
          'uni-fab__content--other-platform': !isAndroidNvue
        }"
        :style="{ width: boxWidth, height: boxHeight, backgroundColor: styles.backgroundColor }"
        class="uni-fab__content"
        elevation="5"
      >
        <view v-if="flexDirectionStart || horizontalLeft" class="uni-fab__item uni-fab__item--first" />
        <view v-for="(item, index) in content" :key="index" :class="{ 'uni-fab__item--active': isShow }" class="uni-fab__item" @click="_onItemClick(index, item)">
          <image :src="item.active ? item.selectedIconPath : item.iconPath" class="uni-fab__item-image" mode="aspectFit" />
          <text class="uni-fab__item-text" :style="{ color: item.active ? styles.selectedColor : styles.color }">{{ item.text }}</text>
        </view>
        <view v-if="flexDirectionEnd || horizontalRight" class="uni-fab__item uni-fab__item--first" />
      </view>
    </view>
    <view
      :class="{
        'uni-fab__circle--leftBottom': leftBottom,
        'uni-fab__circle--rightBottom': rightBottom,
        'uni-fab__circle--leftTop': leftTop,
        'uni-fab__circle--rightTop': rightTop,
        'uni-fab__content--other-platform': !isAndroidNvue
      }"
      class="uni-fab__circle uni-fab__plus"
      :style="{ 'background-color': styles.buttonColor, bottom: nvueBottom }"
      @click="_onClick"
    >
      <uni-icons class="fab-circle-icon" :type="styles.icon" :color="styles.iconColor" size="32" :class="{ 'uni-fab__plus--active': isShow && content.length > 0 }"></uni-icons>
      <!-- <view class="fab-circle-v"  :class="{'uni-fab__plus--active': isShow && content.length > 0}"></view>
			<view class="fab-circle-h" :class="{'uni-fab__plus--active': isShow  && content.length > 0}"></view> -->
    </view>
  </view>
</template>

<script>
  let platform = 'other'
  // #ifdef APP-NVUE
  platform = uni.getSystemInfoSync().platform
  // #endif

  /**
   * Fab 悬浮按钮
   * @description 点击可展开一个图形按钮菜单
   * @tutorial https://ext.dcloud.net.cn/plugin?id=144
   * @property {Object} pattern 可选样式配置项
   * @property {Object} horizontal = [left | right] 水平对齐方式
   * 	@value left 左对齐
   * 	@value right 右对齐
   * @property {Object} vertical = [bottom | top] 垂直对齐方式
   * 	@value bottom 下对齐
   * 	@value top 上对齐
   * @property {Object} direction = [horizontal | vertical] 展开菜单显示方式
   * 	@value horizontal 水平显示
   * 	@value vertical 垂直显示
   * @property {Array} content 展开菜单内容配置项
   * @property {Boolean} popMenu 是否使用弹出菜单
   * @event {Function} trigger 展开菜单点击事件，返回点击信息
   * @event {Function} fabClick 悬浮按钮点击事件
   */
  export default {
    name: 'UniFab',
    emits: ['fabClick', 'trigger'],
    props: {
      pattern: {
        type: Object,
        default() {
          return {}
        }
      },
      horizontal: {
        type: String,
        default: 'left'
      },
      vertical: {
        type: String,
        default: 'bottom'
      },
      direction: {
        type: String,
        default: 'horizontal'
      },
      content: {
        type: Array,
        default() {
          return []
        }
      },
      show: {
        type: Boolean,
        default: false
      },
      popMenu: {
        type: Boolean,
        default: true
      }
    },
    data() {
      return {
        fabShow: false,
        isShow: false,
        isAndroidNvue: platform === 'android',
        styles: {
          color: '#3c3e49',
          selectedColor: '#007AFF',
          backgroundColor: '#fff',
          buttonColor: '#007AFF',
          iconColor: '#fff',
          icon: 'plusempty'
        }
      }
    },
    computed: {
      contentWidth(e) {
        return (this.content.length + 1) * 55 + 15 + 'px'
      },
      contentWidthMin() {
        return '55px'
      },
      // 动态计算宽度
      boxWidth() {
        return this.getPosition(3, 'horizontal')
      },
      // 动态计算高度
      boxHeight() {
        return this.getPosition(3, 'vertical')
      },
      // 计算左下位置
      leftBottom() {
        return this.getPosition(0, 'left', 'bottom')
      },
      // 计算右下位置
      rightBottom() {
        return this.getPosition(0, 'right', 'bottom')
      },
      // 计算左上位置
      leftTop() {
        return this.getPosition(0, 'left', 'top')
      },
      rightTop() {
        return this.getPosition(0, 'right', 'top')
      },
      flexDirectionStart() {
        return this.getPosition(1, 'vertical', 'top')
      },
      flexDirectionEnd() {
        return this.getPosition(1, 'vertical', 'bottom')
      },
      horizontalLeft() {
        return this.getPosition(2, 'horizontal', 'left')
      },
      horizontalRight() {
        return this.getPosition(2, 'horizontal', 'right')
      },
      // 计算 nvue bottom
      nvueBottom() {
        // #ifdef APP-NVUE
        const safeBottom = uni.getSystemInfoSync().windowBottom
        return 30 + safeBottom
        // #endif
        // #ifndef APP-NVUE
        return 30
        // #endif
      }
    },
    watch: {
      pattern: {
        handler(val, oldVal) {
          this.styles = Object.assign({}, this.styles, val)
        },
        deep: true
      }
    },
    created() {
      this.isShow = this.show
      if (this.top === 0) {
        this.fabShow = true
      }
      // 初始化样式
      this.styles = Object.assign({}, this.styles, this.pattern)
    },
    methods: {
      _onClick() {
        this.$emit('fabClick')
        if (!this.popMenu) {
          return
        }
        this.isShow = !this.isShow
      },
      open() {
        this.isShow = true
      },
      close() {
        this.isShow = false
      },
      /**
       * 按钮点击事件
       */
      _onItemClick(index, item) {
        if (!this.isShow) {
          return
        }
        this.$emit('trigger', {
          index,
          item
        })
      },
      /**
       * 获取 位置信息
       */
      getPosition(types, paramA, paramB) {
        if (types === 0) {
          return this.horizontal === paramA && this.vertical === paramB
        } else if (types === 1) {
          return this.direction === paramA && this.vertical === paramB
        } else if (types === 2) {
          return this.direction === paramA && this.horizontal === paramB
        } else {
          return this.isShow && this.direction === paramA ? this.contentWidth : this.contentWidthMin
        }
      }
    }
  }
</script>

<style lang="scss">
  $uni-shadow-base: 0 1px 5px 2px
    rgba(
      $color: #000000,
      $alpha: 0.3
    ) !default;

  .uni-fab {
    position: fixed;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    justify-content: center;
    align-items: center;
    z-index: 10;
    border-radius: 45px;
    box-shadow: $uni-shadow-base;
  }

  .uni-cursor-point {
    /* #ifdef H5 */
    cursor: pointer;
    /* #endif */
  }

  .uni-fab--active {
    opacity: 1;
  }

  .uni-fab--leftBottom {
    left: 15px;
    bottom: 30px;
    /* #ifdef H5 */
    left: calc(15px + var(--window-left));
    bottom: calc(30px + var(--window-bottom));
    /* #endif */
    // padding: 10px;
  }

  .uni-fab--leftTop {
    left: 15px;
    top: 30px;
    /* #ifdef H5 */
    left: calc(15px + var(--window-left));
    top: calc(30px + var(--window-top));
    /* #endif */
    // padding: 10px;
  }

  .uni-fab--rightBottom {
    right: 15px;
    bottom: 30px;
    /* #ifdef H5 */
    right: calc(15px + var(--window-right));
    bottom: calc(30px + var(--window-bottom));
    /* #endif */
    // padding: 10px;
  }

  .uni-fab--rightTop {
    right: 15px;
    top: 30px;
    /* #ifdef H5 */
    right: calc(15px + var(--window-right));
    top: calc(30px + var(--window-top));
    /* #endif */
    // padding: 10px;
  }

  .uni-fab__circle {
    position: fixed;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    justify-content: center;
    align-items: center;
    width: 55px;
    height: 55px;
    background-color: #3c3e49;
    border-radius: 45px;
    z-index: 11;
    // box-shadow: $uni-shadow-base;
  }

  .uni-fab__circle--leftBottom {
    left: 15px;
    bottom: 30px;
    /* #ifdef H5 */
    left: calc(15px + var(--window-left));
    bottom: calc(30px + var(--window-bottom));
    /* #endif */
  }

  .uni-fab__circle--leftTop {
    left: 15px;
    top: 30px;
    /* #ifdef H5 */
    left: calc(15px + var(--window-left));
    top: calc(30px + var(--window-top));
    /* #endif */
  }

  .uni-fab__circle--rightBottom {
    right: 15px;
    bottom: 30px;
    /* #ifdef H5 */
    right: calc(15px + var(--window-right));
    bottom: calc(30px + var(--window-bottom));
    /* #endif */
  }

  .uni-fab__circle--rightTop {
    right: 15px;
    top: 30px;
    /* #ifdef H5 */
    right: calc(15px + var(--window-right));
    top: calc(30px + var(--window-top));
    /* #endif */
  }

  .uni-fab__circle--left {
    left: 0;
  }

  .uni-fab__circle--right {
    right: 0;
  }

  .uni-fab__circle--top {
    top: 0;
  }

  .uni-fab__circle--bottom {
    bottom: 0;
  }

  .uni-fab__plus {
  }

  // .fab-circle-v {
  // 	position: absolute;
  // 	width: 2px;
  // 	height: 24px;
  // 	left: 0;
  // 	top: 0;
  // 	right: 0;
  // 	bottom: 0;
  // 	/* #ifndef APP-NVUE */
  // 	margin: auto;
  // 	/* #endif */
  // 	background-color: white;
  // 	transform: rotate(0deg);
  // 	transition: transform 0.3s;
  // }

  // .fab-circle-h {
  // 	position: absolute;
  // 	width: 24px;
  // 	height: 2px;
  // 	left: 0;
  // 	top: 0;
  // 	right: 0;
  // 	bottom: 0;
  // 	/* #ifndef APP-NVUE */
  // 	margin: auto;
  // 	/* #endif */
  // 	background-color: white;
  // 	transform: rotate(0deg);
  // 	transition: transform 0.3s;
  // }

  .fab-circle-icon {
    transform: rotate(0deg);
    transition: transform 0.3s;
    font-weight: 200;
  }

  .uni-fab__plus--active {
    transform: rotate(135deg);
  }

  .uni-fab__content {
    /* #ifndef APP-NVUE */
    box-sizing: border-box;
    display: flex;
    /* #endif */
    flex-direction: row;
    border-radius: 55px;
    overflow: hidden;
    transition-property: width, height;
    transition-duration: 0.2s;
    width: 55px;
    border-color: #dddddd;
    border-width: 1rpx;
    border-style: solid;
  }

  .uni-fab__content--other-platform {
    border-width: 0px;
    box-shadow: $uni-shadow-base;
  }

  .uni-fab__content--left {
    justify-content: flex-start;
  }

  .uni-fab__content--right {
    justify-content: flex-end;
  }

  .uni-fab__content--flexDirection {
    flex-direction: column;
    justify-content: flex-end;
  }

  .uni-fab__content--flexDirectionStart {
    flex-direction: column;
    justify-content: flex-start;
  }

  .uni-fab__content--flexDirectionEnd {
    flex-direction: column;
    justify-content: flex-end;
  }

  .uni-fab__item {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 55px;
    height: 55px;
    opacity: 0;
    transition: opacity 0.2s;
  }

  .uni-fab__item--active {
    opacity: 1;
  }

  .uni-fab__item-image {
    width: 20px;
    height: 20px;
    margin-bottom: 4px;
  }

  .uni-fab__item-text {
    color: #ffffff;
    font-size: 12px;
    line-height: 12px;
    margin-top: 2px;
  }

  .uni-fab__item--first {
    width: 55px;
  }
</style>
